Shellac-cashew nut shell liquid material reaction product



Patented Jan. 6, 1942 SHELLAC-CASHEW NUT SHELL LIQUID MATERIAL REACTIONPRODUCT William F. Schaul'elberger, Maplewood, N. J., as-

signor to The Harvel Corporation, a corporation of New Jersey NoDrawing.

Claims.

The present invention relates to methods of making products from shellacand cashew nut shell liquid and derivatives of cashew nut shell liquid,and to the products obtained by these methods.

The derivatives of cashew nut shell liquid suitable for use in thepractice of the present invention are cardanol, described in U. S.Patent No.

2,098,824; polymerized cashew nut shell liquid,-

described in Patent No. 2,067,919; ethers' of cashew nut shell liquidand ethers of cardanol, described in copending application Serial Number733,986, filed July 6, 1934; residue obtained on distilling cashew nutshell liquid in making cardanol; also the cashew nut shell liquidproducts and derivatives described in the following U. S. LettersPatents 1,725,791 to 1,725,797, inclusive; 1,771,785; 1,771,786;1,819,416; 1,821,095; 1,838,070 to 1,838,077, inclusive; 1,921,292;1,921,293; 1,950,085; to each of which reference is hereby made.

Examples of the methods of the present invention and their uses togetherwith the products obtained thereby are as follows.

Example 1.-One part by weight of shellac, one part of alcohol andone-quarter part of slightly polymerized cashew nut shell liquid, alldissolved together, coated on paper and heated at 90 C. for a fewminutes to drive off the alcohol. The

paper so coated can be rolled tightly on heated mandrels to form tubeswhereby the cashew nut shell liquid-shellac composition flows and bindstogether the successive layers of paper. After being taken from themandrels, the tubes can be cured at about 280 F. for aboutsixteen hoursto react the shellac and cashew nut shell liquid and to form aninfusible compound which has good electrical insulation characteristicsand is resistant to water, moisture, oils, solvents and chemicals. Atube so made is suitable for use on cores of electric transformers.

Example 2.-From one-quarter to three parts of cashew nut shell liquidand one part of shellac, by weight, are dissolved together. Alcohol canbe used as a common solvent and then evaporated. When dry and cold thecashew nut shellshellac solution can be ground together to a powderwhich can be used for making the tubesof Example 1 and for otherpurposes. 1

Example 3.-Two hundred parts by weight of raw cashew nut shell liquid orslightly poly- Appllcation February 11, 1938, Serial No. 189,931

merized cashew nut shell liquid and one hundred pounds of shellac areheated for 7 hours at 280 F. The resulting product can be milled oncloth to make flexible water and oil proofed fabric and so on and forelectrical insulation. This reaction product of shellac and cashew nutshell liquid can be milled into rubber to add characteristics ofresistance to oils, solvents and chemicals and to increase dielectricstrength.

Example 4.-Five parts by weight of powdered shellac and one part ofcashew nut shell liquid (raw or acid treated according to Patent2,067,919 to leave it in the liquid state) are heated up to 300 F. untilcompletely dissolved and then allowed to cool. The product is hard andbrittle when cool and can be powdered. I

Example 5.--Two parts by weight of cashew nut shell liquid which hasbeen polymerized to the rubber-like state and one part of shellac aremilled together on heated rubber rolls until they are thoroughlyintermingled after which the mass is cured at 220 F. The cured mass canbe used for various purposes, for example, it can be milled into rubberfor given characteristics of resistance to'oils, solvents and so on andtoincrease its dielectric strength.

Having thus described my invention, what I claim and desire to protectby Letters Patent is:

1. The method which comprises heating between about 220 F. and about 300F. a mixture of shell-ac and material selected from the group consistingof cashew nut shell liquid, polymerized cashew nut shell liquid,cardanol, alkyl ethers of cashew nut shell liquid, alkyl ethers ofcardanol and a phenolic residue obtained on distilling cashew nut shellliquid, to obtain a reaction product of the shellac and the selectedmaterial.

2. The reaction products of the method of claim 1.

3. The product obtained by heating a mixture of shellac and cashew nutshell liquid between about 220 F. and 300 F.

4. The product obtained by heating a mixture of shellac and cardanolbetween about 220 F. and 300 F.

5. The product obtained by heating, between about 220 F. and 300 F., amixture of shellac and a phenolic residue obtained on distilling cashewnut shell liquid.

WILLIAM F. SCHAUFELBERGER.

